Conveniently, a subset of DCQA overlaps with the RST Discourse Treebank [1]}, allowing us to directly compare the two types of structures (Figure REF (b)).
We show that the QUD trees are structurally distinct from RST trees. A close inspection of relation-question correspondence reveals that QUD's free-form questions are more fine-grained, and that their presence reduces annotator disagreement in selecting RST relations.
